自蔓延TiC/Ni功能梯度涂层热疲劳性能研究
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摘要
利用自蔓延高温合成结合准热等静压技术(SHS/PHIP),在H13钢表面制备了Ti C/Ni梯度功能涂层,采用自制热疲劳试验设备对涂层进行了600次热疲劳循环试验。采用SEM/EDS对涂层微观组织进行观察。结果表明,涂层裂纹萌生于表面层和中间层的孔洞尖端和缺陷处,25℃和100℃涂层的裂纹垂直于界面扩展到过渡层。25℃涂层在过渡层发生脱落,100℃涂层在过渡层呈龟裂状,200℃和300℃涂层裂纹垂直于界面扩展到基体表面终止。表面层和中间层裂纹扩展发生在Ti C晶粒内,属于典型脆性断裂特征的穿晶断裂。
The TiC/Ni functionally gradient coatings on H13 steel surface were prepared by self-propagating high temperature synthesis and pseudo hot isostatic pressing(SHS/PHIP). The 600 thermal fatigue cycle tests were carried out on the coating by the self-made thermal fatigue test equipment. The coating microstructures were characterized by SEM/EDS.The results show that the cracks initiate at the tips and defects of the surface layer and interlayer, and propagate to the transitional layer of 25 ℃ and 100 ℃ coatings perpendicular to the interface. 25 ℃ coating falls off in transition layer, and 100 ℃ coating appears transition layer cracking. The cracks of 200 ℃ and 300 ℃ coatings propagate to the substrate interface. The crack propagation occurs within the TiC grains of the surface layer and interlayer, which belongs to the typical characteristics of brittle fracture of transgranular fracture.
The TiC/Ni functionally gradient coatings on H13 steel surface were prepared by self-propagating high temperature synthesis and pseudo hot isostatic pressing(SHS/PHIP). The 600 thermal fatigue cycle tests were carried out on the coating by the self-made thermal fatigue test equipment. The coating microstructures were characterized by SEM/EDS.The results show that the cracks initiate at the tips and defects of the surface layer and interlayer, and propagate to the transitional layer of 25 ℃ and 100 ℃ coatings perpendicular to the interface. 25 ℃ coating falls off in transition layer, and 100 ℃ coating appears transition layer cracking. The cracks of 200 ℃ and 300 ℃ coatings propagate to the substrate interface. The crack propagation occurs within the TiC grains of the surface layer and interlayer, which belongs to the typical characteristics of brittle fracture of transgranular fracture.
引文
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[2]王荣滨.铝合金压铸模失效分析、选材与强化处理研究[J].模具制造,2008,8(2):76-80.
[3]Rasgado M T A,Davey K,Clark L D,et al.Bi-metallic dies for rapid die casting[J].Journal of Materials Processing Technology,2006,175(1-3):109-116.
[4]Lousa A,Romero J,Mart?nez E,et al.Multilayered chromium/chromium nitride coatings for use in pressure die-casting[J].Surface and Coatings technology,2001,146:268-273.
[5]Srivastava A,Joshi V,Shivpuri R,et al.A multilayer coating architecture to reduce heat checking of die surfaces[J].Surface and coatings technology,2003,163:631-636.
[6]Birol Y,Isler D.Thermal cycling of Al Ti N-and Al Ti ON-coated hot work tool steels at elevated temperatures[J].Materials Science and Engineering:A,2011,528(13):4703-4709.
[7]穆柏春,刘秉余.金属表面化学反应陶瓷涂层的研究[J].硅酸盐通报,1997(6):19-22.
[8]Levashov E A,Mukasyan A S,Rogachev A S,et al.Self-propagating high-temperature synthesis of advanced materials and coatings[J].International Materials Reviews,2017,62(4):203-239.
[9]张幸红,韩杰才.TiC-Ni梯度功能材料的SHS研究[J].无机材料学报,1999,14(2):228-232.
[10]殷声,缪曙霞,廖湘巍,等.SHS-加压法制备TiC/Ni梯度材料[J].北京科技大学学报,1993(1):99-103.
[11]马向平,陈威.自蔓延技术在模具上的应用研究[J].模具工业,2006,32(12):67-70.
[12]潘成刚,赵川翔,刘笃笃,等.SHS/PHIP法压铸模表面制备TiC/Ni功能梯度涂层研究[J].特种铸造及有色合金,2017,37(7):743-746.
[13]王零森.特种陶瓷[M].长沙:中南大学出版社,2005.
[14]王家祥,黄燕清.陶瓷薄膜与金属间的浸润性及其界面的研究[J].真空,1991(3):26-31.